https://help.tallysolutions.com/docs/te9rel50/Data_Migration/Upgrading_to_TE9_Release_5.htm
Upgrading to Tally.ERP 9 Release 5.0
To upgrade to Tally.ERP 9 Release 5.0
Download Tally.ERP 9 Release 5.0.
Install
Tally.ERP 9 Release 5.0 on your system.
Backup your
data before migrating to Tally.ERP 9 Release 5.0.
Migrate or move your data to
Tally.ERP 9 Release 5.0.
'Upgrading to Tally.ERP 9 Release 5.5' has been shared with